DESIGN AND IMPLEMENTATION OF PEER-TO-PEER (P2P) INTERNET ONLINE HYBRID TEST SYSTEM

摘要

A new Internet online hybrid test system, designated the "peer-to-peer (P2P) Internet online hybrid test system", is proposed. In the system, the simulated structure is divided into multiple substructures and each substructure is analyzed numerically or tested physically in parallel at geographically distributed locations. The equations of motion are not formulated for the entire structure but for each substructure separately. Substructures are treated as highly independent systems, and only standard I/O, i. e. displacements and forces at the boundaries, are used as interfaces. A "Coordinator" equipped with an iterative algorithm based on quasi-Newton iterations is developed to achieve compatibility and equilibrium at boundaries. A test procedure, featuring two rounds of quasi-Newton iterations and using assumed elastic stiffness, is adopted to avoid iteration for the substructure being tested physically. A fast and stable solution using a socket mechanism is developed for data exchange over the Internet. The new system proposed in this paper is expected to be capable of simulating large structural system.